Okay, I looked it up online, and it sounds like it’s nothing serious. In all likelihood, I probably just tempoarary dislocated my “Tempero Mandibular Joint” from biting down too much lately, which I tend to do while working on music (that is to say, constantly while working on music).
I just need to be aware of that and, well, stop it! So no alarm, but thanks for making me worry enough to look it up! Now I’m not confused!